Intermittent screen flash in dual monitor mode?

I've developed an interesting problem - A few months back there existed some fault with kde's treatment of the xf86-video-ati drivers which meant that, if you had compositing enabled, it would randomly segfault and die. This was slightly irritating.
So, recently, In an act of pure, stupid, and uninformed optimism, I decided to see what would happen if I just asked pacman to upgrade me to the latest version of kde (In case the problem from before has been fixed - for comedic effect).
This went predictably badly, although the fault in question does appear to have been fixed. However, as part of it's dependencies the new kde brought in new ATI drivers, and somewhere along the way an entirely new and exciting fault that causes my secondary monitor's image to flash to black for about 1 second in 7 has been picked up.
From my own investigating/googling so far, I've determined this is something to do with KMS and my display drivers. The flashing persists even in text mode, but only affects the secondary screen (The other one works fine). If I add nomodeset to my grub kernel boot line then the flashing ceases in text mode, but Xorg segfaults when I try and start it.
Has anyone else encountered this particular fault? Any advice on how to fix it?
Thanks!

Thanks for working that out, but I'm still horribly confused. I've been tinkering with things today to improve my boot speed (new kernel, messing with module loading and so on), and the problem seems to have gone away by itself. I have at no stage had anything to do with upower (it hasn't been installed).
How perplexing.
Anyway, problem solved, thanks everyone, and well done Sayo for working out the problem! (Even if it appears that MY problem was unrelated )

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